Thanks for the kind words, guys.
The overdrive sound is just the AxeFX's drive block on the "Plus" setting, which is the MXR Distortion + emulation. I also use a little delay with the tap tempo on there, but no compression. I use the same basic preset all night long, just switching in and out the effects blocks as needed.
Keyboard player is using a Nord rack for the Rhodes sound, with a phaser and reverb added, I think. Great tone.
Embarrassingly, I have zero knowledge of theory, modes, scales, etc., I play by feel. But the thing about soloing over Slipknot is, the jam is in A minor, and stays there, but for what I'm doing, I'm alternating every two bars between a scale that fits in with A minor and D major, if that makes sense. I think that's how Garcia approached it, as well.
During the A minor bars, the notes in whatever scale it is I actually play would be A A# B C D D# E F# G ( a bend from B to C sounds good) ... the A# and D# are only a chromatic grace note, if that makes sense, just passing it by between on runs between the A and B or D and C notes or vice versa.
... and in the D bars D E F F# G G# A B C C# (bends from F to F#). The F and the G# would basically be chromatic grace notes, and the most emphasized note would be the F# -- a lot of the chromatic runs I do down seem to start off that F#.
Hope that helps ... but I doubt it! If anyone knows what scale or mode that is, clue me in!
